Dataset: Quantitative separation of thermal and electrochemical contributions in NLEIS measurements

This dataset provides experimental nonlinear electrochemical impedance spectroscopy (NLEIS) measurements for a Molicel INR18650-M35A lithium-ion battery, supporting the research article published in the Journal of Power Sources (https://doi.org/10.1016/j.jpowsour.2026.240924). The data enables investigation of battery linearity thresholds, nonlinear behavior characterization, and validation of impedance measurement protocols across various operating conditions. A key contribution is the separation of electrochemical nonlinearity from thermal effects during NLEIS measurements, achieved through auxiliary high-frequency impedance measurements that enable continuous internal cell temperature estimation. For detailed information about data structure, experimental protocols, and data processing methodologies, refer to the README.md file included with the dataset.本数据集为Molicel INR18650-M35A型锂离子电池提供了实验性非线性电化学阻抗谱（nonlinear electrochemical impedance spectroscopy, NLEIS）测试数据，支撑了发表于《电源学报》（Journal of Power Sources）的研究论文，其DOI为10.1016/j.jpowsour.2026.240924。 该数据集可用于探究电池的线性阈值、表征其非线性行为，并验证不同运行工况下的阻抗测试规程。本数据集的核心贡献之一，是在NLEIS测试过程中实现了电化学非线性与热效应的分离——这一分离通过辅助高频阻抗测试完成，该测试可实现电池内部温度的连续估算。 如需了解数据集结构、实验规程及数据处理方法的详细信息，请参阅数据集附带的README.md文件。